Samsung is dealing with yet another explosive problem.

The prosecutor's office said it is investigating Samsung(SSNLF) over possible links to the case involving President Park Geun-hye and her close confidante Choi Soon-sil. Park is accused of letting Choi, who does not hold an official government post, view confidential documents and presidential speeches.

Local media and opposition parties have accused Choi of using her relationship with Park to accumulate millions of dollars in donations to her foundations. Samsung, the country's biggest company, is alleged to have been among the contributors.

South Korean news agency Yonhap reported that prosecutors are looking into whether Samsung illegally funneled more than $3 million to a company owned by Choi, allegedly to fund her daughter's equestrian training in Germany.

Samsung and the prosecutor's office declined to comment on the allegations reported by Yonhap.

Thousands of South Koreans demonstrated in Seoul on Saturday, demanding the resignation of President Park Geun-hye.

In South Korea, Samsung is more than just a smartphone manufacturer. The conglomerate accounts for a big chunk of the country's economy, reaching into many parts of South Koreans' lives. There are Samsung hospitals, amusement parks, apartment complexes and even a dog adoption center.